Have you ever deleted your factory files off your archos well here is a link to get them back, this includes the operating system, factory photos, movies and music.
these should never be deleted as some of the folders contain the information to make your archos work.
infact this link provides the operating system for all archos models, yet you cant find them if you google them.ftp://support.archos.com/Archos_604_WiFi/
hope this is help full.
As you can see its not a www, but ftp